Contents

Performance Optimization

Introduction

Your Apps performance is a crucial element of the user experience. Try to avoid bad performing patterns like doing work on the UI thread and learn how to write fast and responsive apps.

Save View lookups with the ViewHolder pattern

Especially in a ListView, you can run into performance problems by doing too many findViewById() calls during scrolling. By using the ViewHolder pattern, you can save these lookups and improve your ListView performance.

If your list item contains a single TextView, create a ViewHolder class to store the instance:

static class ViewHolder {
TextView myTextView;
}

While creating your list item, attach a ViewHolder object to the list item: